adaptParameters, constructorFromUse, and methodFromUse cleanups

[wmdietl]

AnnotatedTypes#adaptParameters is called after calls to constructorFromUse and methodFromUse.
The xFromUse methods should already return the signature of an executable element for that particular use.

The handling of synthetic constructor parameters is also inconsistent. If they are in the parameter list, we need to make sure there are corresponding arguments in invocations.
At the moment, these parameters are simply dropped from the parameter list, without checking that the types actually match.
In certain situations that is okay, e.g. for an anonymous constructor no explicit types can be provided.
But is it okay e.g. for an implicit outer this parameter? Shouldn't these be checked against the (implicit) argument?

[wmdietl]

The adaptParameters calls are fixed by #406.
The enclosing receiver issue is fixed by #405.
For the handling of synthetic parameters, there is a new issue #400.